Frederik - Here's a possible solution [http://eshop.macsales.com/item/OWC/SSDAPEPMU3E/|OWC SSD Case]. While it's noted to be for the older MBA I do think it will work. Give them a call or email to double check, they may have just not tested it yet.
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UPDATE: They now make a collection of different cases to hold the different series SSD's! Go to their web site and search "Envoy Case" to see the different units.
Frederik - Here's a possible solution [http://eshop.macsales.com/item/OWC/SSDAPEPMU3E/|OWC SSD Case]. While it's noted to be for the older MBA I do think it will work. Give them a call or email to double check, they may have just not tested it yet.